BOARD01993

• Board Meeting Date: 11/15/1984
• Description: Agenda, Minutes, Memos
• Board Meetings - Doc Type: Meeting

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COLORADO WATER CONSERVATION BOARD
Department of Natural Resources

APPENDIX C

STATE OF COLOR!\DO
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J21 State Centennial Building
1313 Sherman Street
Denver, Colorado 80203
Phone: [phone]

Richard D. lamm
Governor

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J. William McDonald
. Director

David W. Walker
Deputy Director

TO: Members, CWCB

FROM: Bill McDonald

DATE: November 8, 1984

SUBJECT: Agenda Item 9, November 15, 1984, Board Meeting--
POlicy Concerning Designation of Approximate
Floodplains

Introduction:

The Colorado Water Conservation Board is, by statute,
responsible for approving and designating 100-year floodplains.
These designations are a prerequisite for the implementation of
floodplain zoning by local governments (towns/cities and counties).
To date, 235 resolutions have been enacted by the Board which have
designated and approved approximately 3200 miles of the state's
100-year floodplains and channels.

These designations have heretofore been, with a few
exceptions, based on detailed hydrologic and hydraulic engineering
studies using state of the art techniques. This has resulted in
as accurate a determination of flood discharges, water depths and
velocities, and areal extent of flooding as could reasonably be
required. The standards for the performance of floodplain studies
and for the Board's subsequent designations have been established
by the Board pursuant to statute.

A review and recitation of the Board's statutory authorities
may be found in the attachment to this memo.

Discussion

with cutbacks in state and federal funding for detailed
floodplain studies, some local governments are requesting that the
CWCB designate and approve approximate 100-year floodplains in
order that they can exercise their zoning powers. By
"approximate,. it is meant that one or more of the parameters which
go into the delineation of a floodplain (i.e., base mapping detail,

APPENDIX C

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